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For severe heart failure patients, an LVAD, or left ventricular-assist device, helps the heart pump blood. 7asmin via Wikimedia Commons hide caption

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7asmin via Wikimedia Commons

The Peregrine Fund recently released four California condors over high cliffs in Northern Arizona. In 1982, there were only 22 of these giant birds left in the wild. George Andrejko/Courtesy, Arizona Game and Fish Department hide caption

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George Andrejko/Courtesy, Arizona Game and Fish Department

The Flight Of The Condors, And Their Audience

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EPA To Dissolve Office Of Science Adviser

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State herpetologist J.D. Kleopfer says the discovery of a two-headed copperhead snake in Northern Virginia earlier this month is an "extraordinarily rare" sighting that few of his colleagues have seen. J.D. Kleopfer/Virginia Dept. of Game and Inland Fisheries hide caption

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J.D. Kleopfer/Virginia Dept. of Game and Inland Fisheries

WATCH: 'Extremely Rare' 2-Headed Snake Stuns Social Media, Charms Scientists

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NASA Hosts Conference All About Looking For Signs Of Civilization Beyond Earth

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Fire ecologist Malcolm North looks down at the still-burning Lions Fire from a ridge in the Sierra Nevadas. Nathan Rott/NPR hide caption

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Nathan Rott/NPR

Fire Ecologists Say More Fires Should Be Left To Burn. So Why Aren't They?

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The edges of this sycamore leaf are turned upward into a cuplike shape, the typical sign of exposure to dicamba. Dan Charles/NPR hide caption

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Dan Charles/NPR

A Drifting Weedkiller Puts Prized Trees At Risk

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More kids are eating at fast-food chains like McDonald's, according to a new study, but parents are buying the healthier side options only about half the time. Miguel Candela/SOPA Images/LightRocket via Getty Images hide caption

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Miguel Candela/SOPA Images/LightRocket via Getty Images